Behavior checklists are often utilized to screen for Autism Spectrum Disorders (ASDs) when comprehensive evaluations are unfeasible. The usefulness of two behavioral checklists, the Gilliam Autism Rating Scale (GARS) and Child Behavior Checklist (CBCL), in identifying ASDs was investigated among 109 children with Autism, 32 children with ASD, and 51 Non-Spectrum children based on Autism Diagnostic Observation Schedule-Generic classifications. The GARS did not distinguish children with ASDs from those without. The Withdrawn and Pervasive Developmental Problems subscales of the CBCL were higher among children with Autism than among Non-Spectrum children. These CBCL subscales also had better sensitivity and specificity in identifying children with Autism than the GARS. Results suggest that the CBCL is a useful behavioral checklist for screening ASDs.